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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0084d9f7a88287ae9b9547f141888c7a53c0ca055bae1bf75efc602737fb32' 
  AND token = 'HrkWqqPSB62MTcvD+jBchFtgqiqRNv2cDs3iCberjOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}